Mixed-mode fracture analysis of orthotropic functionally graded materials under mechanical and thermal loads

Dag S., Yildirim B., Sarikaya D.

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, cilt.44, sa.24, ss.7816-7840, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 44 Sayı: 24
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.ijsolstr.2007.05.010
  • Dergi Adı: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.7816-7840
  • Anahtar Kelimeler: orthotropic functionally graded materials (FGMs), singular integral equations, enriched finite elements, mixed-mode stress intensity factors, thermal stresses, I CRACK PROBLEM, ELASTIC-CONSTANTS, BARRIER COATINGS, INTERFACE CRACK, FGM COATINGS, EDGE CRACK, MICROSTRUCTURE, ELEMENTS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Mixed-mode fracture problems of orthotropic functionally graded materials (FGMs) are examined under mechanical and thermal loading conditions. In the case of mechanical loading, an embedded crack in an orthotropic FGM layer is considered. The crack is assumed to be loaded by arbitrary normal and shear tractions that are applied to its surfaces. An analytical solution based on the singular integral equations and a numerical approach based on the enriched finite elements are developed to evaluate the mixed-mode stress intensity factors and the energy release rate under the given mechanical loading conditions. The use of this dual approach methodology allowed the verifications of both methods leading to a highly accurate numerical predictive capability to assess the effects of material orthotropy and nonhomogeneity constants on the crack tip parameters. In the case of thermal loading, the response of periodic cracks in an orthotropic FGM layer subjected to transient thermal stresses is examined by means of the developed enriched finite element method. The results presented for the thermally loaded layer illustrate the influences of the material property gradation profiles and crack periodicity on the transient fracture mechanics parameters. (C) 2007 Elsevier Ltd. All rights reserved.